package basic_practice_1025;

import java.math.BigInteger;
import java.util.Scanner;
/**
 * @author MemoryC
 * */

public class Main {

	public static void main(String[] args) {

		Scanner scanner=new Scanner(System.in);
		
		while(scanner.hasNext()) {
			
			BigInteger a=scanner.nextBigInteger();
			BigInteger b=scanner.nextBigInteger();
			BigInteger c=scanner.nextBigInteger();
			
			if(a.add(b).compareTo(c)<=0||a.add(c).compareTo(b)<=0||c.add(b).compareTo(a)<=0) {
				System.out.println("No");
			}else {
				System.out.println("Yes");
			}
		}
		scanner.close();
    }
}